Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e2392c6274f66d058c7722e55237b01fb00d13d455f66f2dbe46efebfc84ec' 
  AND token = 'CE/GrJKqHxxYxC46ELHa8bu+XAQkpjGg+AVGKD0Edok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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