Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d817ca4c1b446060b7e1cca91558d10a927e58977e76ce9b0a288dd11b6d70' 
  AND token = 'HE/hEJBVp5ndOzS2Mn2lSKXKD+Ls6/RoH5camQJfy9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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