Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375d2c21271954d3557406bb186347b63c701ca67e4c13513ea9cd38788a926e' 
  AND token = 'mvUCtAyTywmkZypZQ/9mdXhoOJ51r524hstoP+azZ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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