Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6341c97afb7278fe0fa5d6bfe4f12901f8fe74f336be388bffac3642e4cf88e9' 
  AND token = 'jF3ONNdrKNXw1i3RMCu1iCjbt/036u5YboYP2pIseW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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