Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53ca0ac74447a940aaa1e9e1bc6c47b9ddc35562c6a46cd1c323567a3cf0430' 
  AND token = 'E2LSEV7u0U/w2jNZ4/9LxQunSRrmDRH8Tp2wc83uukA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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