Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfc5d6e027630c611920ab06f6b188c58da20d42360d60bc38d8a536a0eb250' 
  AND token = 'Mq0DzSUZkPpQNzGDae+HCrVaE1WE5gNAXjUxySEBXJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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