Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a520b115110dd97970abea51f8924541b8b7efeb8263172937c47ee99bb2e0' 
  AND token = 'PLkmeP2rErHzkil3sfVR6X78VUGd4flolHZvohOIiEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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