Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c1cbc2efb43695c0c483b9577ef1cf65f67c2902e7881afa77f11bbe1a1fbb' 
  AND token = 'xJT2eTgLH0AIxY7jN4DdzfLrmvfhDx3VRfuiETkx+sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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