Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850f27f3641411b53e1eecd1d710516719f7774179eabee74cb93f16eb77e7fe' 
  AND token = 'uAuMFcoB1uUQ3z+DghZnU+CpoQIf90Slm+MfgMY2vEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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