Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defc3ad789266cdfb3ea4fa89d456cfc8136f00c2419ad02920cd8ce1f093cf8' 
  AND token = '/EQj9IOkLr9unMHMhu8/Yej7PyrbPcrVWBWFt2pn1E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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