Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe3210e5dda1142d2fe45fa3590fc21500ebd0ba157a54715c7beac9409748c' 
  AND token = '7lEzhHoI3Zp41UiDMXPluZOh8MLJ2EjvBRbonkGi0rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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