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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b357de55d5f574e7422283903771b2317b45cef20550bb29b6e8bbe5a9b443f' 
  AND token = 'SJQq1XPJGY+e5pKvbpZ42XmvrDXnNmnSamtt6QU2wyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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