Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af5e83c24673990b7214ad37ac7060b864a1597e62ab0be20135756be194be9' 
  AND token = 'kL038+jIzzmSCbeHJAHijBmL/zmSfEqpgMhwdIePDAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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