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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '90a26e44cd59278723899afe51dce44fb720db6c50b3c836fe32fca4e96eee50' 
  AND token = 'xevzgtINS95YDSX9j8/m6M70pXgPDUwotJnJqOFEjFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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