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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e354114f51e6672e162d86567199e2800c8c2bbeacc3c4f166f492392a79403f' 
  AND token = 'UNlP8XC/1jqED6Hl+UThuE75NK2wCq5avE8eT3iN6qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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