Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de24e0b2e8f5fbd7b148a5c60cac0ad5c5b677786f19e9860e2ffa386d1a9ed8' 
  AND token = 'JZrLwhJK4PXBPZ5VyYZdb2TWYADfBSeXnR4hiFPUKr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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