Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e3c116d7e670c316de66cbcf12a400ff3f25175e75b8909d57971288ac1da5' 
  AND token = 'rdSPCiBfmp29LiO6j1LREszCt7ubTOsrsWSrLG8iO6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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