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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f41d43c23b18f6b6a04e807084ba051a60ef89909175ad25a5cc01b064818810' 
  AND token = '1qK/1BAsM11Ac/KboorLQ0fotWaXZoJFf25hMi+CBYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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