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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd537b6f0bf1cdf8bc07534f797d62a937adcffe548ae2a1fd6c6880d828570f6' 
  AND token = 'DLs0qsSOEZesW69sjGURPtRVOcVp8zQzlwWl6nU9U1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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