Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f9499a263846c7064b973d3bf7fcb0b2a4e43061ba8bf5a1315a665ed77149' 
  AND token = 'nN1mpHfhl3+mFmFx5nMbFU6AVqOWz5icCoafRWfxuS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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