Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7a60aed97afdbcc824e40c9fc7c45dc81640d178cf7f724110f2a3b6c8aace' 
  AND token = 'd5bJX4+6gwcLycCoGrQiQeKM6Ka7BP4fIZhUWXvl2vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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