Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235114ff7fefcddb4e23a46bd6fbb52de71939a83036f5efd22d728358b52780' 
  AND token = 'QLhrwHgJrUl4ADX6C/u+nJ83I1aT1U5T9lHI1DbAb0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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