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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fb6796142e0490e8a7d6b1298477945160f714ad2a30b95ede9b7aeb9445137' 
  AND token = '9iaIUOEsxEW04MCxYWmbSoWwgC2vUOd7RNd8y7Oq7YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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