Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2f56b3f3469f40e97d4ca2ccd0744e3037819c853de4e032bf4fcded007c1c' 
  AND token = 'f+N7OMxCYsKOsexL2xXjMwiHrHxHrb3Qp8mYIT2M2Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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