Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ad923442f5d40d7d0f65cf2f969e80bba52a9aa7979a0fd2c720147308b9ce' 
  AND token = 'jU+1FxygUKTssDI78fAO4yx04DqSQvWInLr9MbcRR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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