Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6e8bc6eadc6711d50bce4179d7c91c4fed18e4d63bedd64b96ee83b6160e5c' 
  AND token = 'uECj6H6SnD2xofd1qmVFuHLQNAforjZqvEpicbXmqIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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