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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c388898a6071549aa8b9013deeb6e58375e4866ae530e450270bf6004127d7ca' 
  AND token = 'hRX6jlFaoswdtHOycEwGqNEa4DOGWMWAzk3lXspGU0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}