Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e0d1ca2705ed8803d06107500688dc84582d25f329a1cca5805849c63079a4' 
  AND token = 'bbX2YQ35P8Gf9QuATAzWg8tCAk9akfkToUE9UTVhDB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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