Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13c0263cff83545f9332afef0f4f4ce2c1a95d66fd17f22a100b7daa3b9a42b' 
  AND token = 'LxSdAzxiTxHq4IIlNiVmBv4KddcPCpORdmIonzVnINI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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