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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '781fb33b2346a0b1cda894b133c267e5d8335ba461dfcc01554baf04960b96ff' 
  AND token = 'ArT2jTVQ3UwG4urV9f4y2DH6Mwmo6C9j5kknAQEppZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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