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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f5283c5d3a388be1e1f3adcae40194105a048ca4bf4f129671bea364f91ff59' 
  AND token = '/ndgN5D+T3KNdWIPmrT7xyWeLMx03hFqJRUGT4gBdwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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