Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ec40e3863f7d0ec2cd8ad81ce73377d86741fbfeaaf6e15b02c91da8d867ea' 
  AND token = 'Qb0qNdhiyRH0ZMO4wblkDOUJL5YLla4h2LKOTs7eGsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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