Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c566be40ba2ec23ac7166247070707f76f4cce7bef229b776c92f98ae2b1739b' 
  AND token = 'BrbX7cZnN2Oe6Ib+tr84NsZ+5CAQRNz6Y7hUtip4RcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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