Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136000e147b03bdc70bab7f6b53308aceda4e738a521ed6f35ae796c266d2918' 
  AND token = '8yruT8ImNcq4iOiw1nD3qsyVEpdNkAOmkzN2NXYaLkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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