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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '97652d6213ee97b28b0d6316e59bc9eb75ee3e97807ec6b20d0d300c507795f1' 
  AND token = 'iqlZHtRRBbGeux557rdKpknAifPwpWOD2OeQyUjvHZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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