Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9718a338b7263dae3668004e37f92818a54e8932e0a3a6275e58fdf6a3699ab' 
  AND token = 'T5U0RMvcSMT/cl+mERN2n3Id9UACLCbBWIjmsuyhUCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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