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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a27b11ed61d317a60d1a9d85e48c38335f7e8031b852b4105bcfea79e18c6596' 
  AND token = 'ugYjPbysQhAvKcL8YIaKInPToEszJ9c5ko/JwaavOOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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