Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5026c115371cadba353034e791d326bea2b8f3eb9e0e5be0192469efb78302ce' 
  AND token = 'FwsGi1Nt6UnfLQQ+bFYhHJjcZiv7POSHYa6XTrZ2Lj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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