Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d06e240ffbc2cbc12a2b80bd9d850a978967e909a3be4ad43ec8d0e0f6f9dda' 
  AND token = 'kWDqjLCVYCDlhkUjoWFKSGxws3yjXMyGydkcCLuBYM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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