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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d2fa2c98d2ebc26330c828b7b33ede04087f3a42f1a70341abd0cdf3f304622' 
  AND token = '4h47+cz8qTWEQlxacgiiwKq1FntR+TdzJ5FBlcseuEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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