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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c4809b1a2f17156d228a276513d88f8d64a4f9cf67c7f74ea506979ecd245cd9' 
  AND token = 'Z3xTBoN1kl6q38EVebBzHpOfFhKkqN19prDeg1oyP40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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