Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0e7df8f9d43e03902e4d76219e1bdadca224794d302f0b6ab914739ee7e887' 
  AND token = 'D/dnaTW1ou/e+aGLC3gFddtPPDsn1TWthsod4BqODVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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