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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c878322c4eb6f9d1a76c824095660233f5732f49d159d7347dff26e5c5f8d912' 
  AND token = '5WmhmFv4GQK2EZWf2q4WvPMHFVk10Yf5VTxuflYH7iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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