Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8682b022991768426d437e604afa5d3c4f0d9dcfe11a6cb2268d8db8d11b093' 
  AND token = 'gTTu4F+6PRJnc+kXZXy66IMbptgQ0Jhx8G8E1GRJU+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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