Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dec8ee4b4e0a31502a93388dedc7575f252fbcf9596b0b0abaaba227b06ce8' 
  AND token = 'UZ17VnY5ekTbz/J+QpkxMOQb3zBHyx6uKAsvY8LWEN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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