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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '48e70ef506456447ae5012e6bade09a7974fcace2fe9830376fe9a7e54743860' 
  AND token = 'PezIbJuAAciwTvUOvcN1qavVbjn5o7ciQpgemF1ia5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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