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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c44147491ce945251ec287e55a05eb7fd601f293da549b2c8075a45e6b4a6d6b' 
  AND token = '7e4i7te/t8Vk+yNarJ76ZNMrRulcEp9ZrVnPVxw8Ugw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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