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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb2dd5a463e088f3b43906bfcf30ee3db6869ce2aea9e566635a31e9b9364323' 
  AND token = 'a9ib6aNaZVoItzBTHxT8JQFQAYk7xP5F5Q6eBtOvkMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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