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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '25396d387e39662de0556e7abfe8cefc83db034e56fd30c02e8e91dcc18dc6a3' 
  AND token = 'sSDxEfnmb7q1xdfm/QxdfXM+ICCTrDpAF+AoiIYVIIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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