Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e37209f8ac443004a1086d14821e43c6fcfbaa3e059efa8d2f4eaab5423148' 
  AND token = 'UoYrzU1K8l+fGAKzGNAEOs4ky5I4LmfnwhQ73RdDN7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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