Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55f4986540c79cc66c155a4567498d592489ad466148a9195a9e3cace9cd38f' 
  AND token = 'lI7Afsw41cC1p344tK6+VKAM2g5NsCj3PGEGxV7zt1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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