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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2b487e912eed2bb086328c2770bcf3dcb83fd7005a7d1cd43b29a2ba4fa15056' 
  AND token = 'TcAQCG6uZLZBAse/2dSuI8r2um1qWHyyWs0kJo+qGqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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