SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30a543a13434de2746a2224cb6ca10a839846d56353d0f933a160139ced78981' 
  AND token = 'HHp1hOCPcBz/uLEh2GcPHhqHZvfnIZJujNANIIlDc5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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