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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d453c07565cb1f23f146c5da77c4982f1592ef86958b2dea5c345f7579be56b' 
  AND token = 'OMrGp+cYpMvV99paQKfd2Fnci0EbxXdDzgD32OvA9v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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