Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dbfe6ca74767aa7416eaaa1e7167431fc2c52512c1c3a52d7618e6e340a14b' 
  AND token = 'p7YEWkjwfXdks1A+80BSm38wbnWi4KVDrLfUiC4GAco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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