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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75819a77d42598eb24aa4a3e26b23c4fa471eb4e27928c31527df6eaf725869b' 
  AND token = 'WecYVVXez6obQ7WILKcIiuWTiVODSV7jbeMCsGRrW5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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