Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716c27a22b2a8ef198bbf048e74f240dede13b84971ba34cd9ccabea062bf75b' 
  AND token = 'b0iVCLnJ8Hg78kwFvmwp30s6H7NosQ/KsGeHR/MCAEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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