Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b12a73374eeaf15317640fe2593062df2a2eefdf0a299247ff6e524d5aaca2' 
  AND token = 'RySTs+i6Rkm1YQr8z1pde78JVnK4JkemJ6MXA5aQZaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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