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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c9da681d94b4e9bb2ada280c78f174cfa4ca9f8e52a8f15476248b141b08592' 
  AND token = 'KjzDo2O4sMzNl7yZY6V5pR24uCRnSQvxDyE1gPlIpFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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