Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4705edc58ac4b2aa56e6f46618916ccd836bab9ade8839a3dbf152b5ed6dc2' 
  AND token = 'ECR3hJvZ0QRh0kK9cP/RB5bPPdgAY7pxOGl1LDa86EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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