Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9ccdb16fe5a4f54b70a6b774c72730042c8930071d6f63e3a1abeee61cfed1' 
  AND token = 'jUwfk+Rt8rXtSBDDnVE8EkChJSDHNxQIZvAHIxKCA+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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