Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d93a4ff2807b712246b8d460fb0b65565f0c559eca9a5c5a82ed887101e37e' 
  AND token = 'Yj1typ5ZOmkExitaRi7CRdlfAzacT8LuN6xYJpgT/qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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