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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f9fff37b948c8ba09ec93820ea30bb1c0b3edb084f55b8d445b623760cb30f2a' 
  AND token = '4GY/uxPOIbup7XdGLDgIAhTOuFhxdM/dNQuqnaEN+OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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