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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7b9b55ce70300e345931615465b579daf98a9ae20a9195d95b87785427f8ff58' 
  AND token = 'uO7t4lPKJgO/oQFNAztXF8q1d7DX8/O7iaYapZDjg1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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