Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cf754dca8fb1fb50f5d95c7309b2f86254f818655d31d0833d0d1bdf01b916' 
  AND token = '/Q0ATeYxwiwRvi0CpuUHMlNtIlLbM8blc52ny0it7WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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