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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4359d4cc28df9a552584a3b453537501101a75e3e5082718a204dcb49a0bd693' 
  AND token = 'TXMFoBSmPAJTTEKr6Z9Y8VCxpsdKBXC2Pls4NJLwmmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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