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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '823c3648c7c7082f81db89d3c00250aeaec9ef097671ea664580cef89b092ae0' 
  AND token = '1yirW3B2hCK/w3n2hskRx9LRKTHmX8J3szBUWwAUUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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